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Length of proof is 16.  Level of proof is 4.
 
---------------- PROOF ----------------
 
116 [] s(xa,s(xa,xp))=xp.
264 [] xc2!=ext(xp1,xp2,xp1,xa)| -opposite(xt,xr,xcs,xc2)|Col(xt,xq,xa)| -Col(xr,xcs,xa)| -Col(xp1,xp2,xa)| -parallel(xt,xq,xr,xcs)| -parallel(xt,xq,xp1,xp2)|T(c12111(xt,xq,xr,xcs,xp1,xp2,xa),b12111(xt,xq,xr,xcs,xp1,xp2,xa),xt).
265 [] xc2!=ext(xp1,xp2,xp1,xa)| -opposite(xt,xr,xcs,xc2)|Col(xt,xq,xa)| -Col(xr,xcs,xa)| -Col(xp1,xp2,xa)| -parallel(xt,xq,xr,xcs)| -parallel(xt,xq,xp1,xp2)|Col(xp1,xp2,c12111(xt,xq,xr,xcs,xp1,xp2,xa)).
266 [] xc2!=ext(xp1,xp2,xp1,xa)| -opposite(xt,xr,xcs,xc2)|Col(xt,xq,xa)| -Col(xr,xcs,xa)| -Col(xp1,xp2,xa)| -parallel(xt,xq,xr,xcs)| -parallel(xt,xq,xp1,xp2)|Col(xr,xcs,b12111(xt,xq,xr,xcs,xp1,xp2,xa)).
267 [] xc2!=ext(xp1,xp2,xp1,xa)| -opposite(xt,xr,xcs,xc2)|Col(xt,xq,xa)| -Col(xr,xcs,xa)| -Col(xp1,xp2,xa)| -parallel(xt,xq,xr,xcs)| -parallel(xt,xq,xp1,xp2)|xa!=c12111(xt,xq,xr,xcs,xp1,xp2,xa).
268 [] xc2!=ext(xp1,xp2,xp1,xa)|opposite(xt,xr,xcs,xc2)|Col(xt,xq,xa)| -Col(xr,xcs,xa)| -Col(xp1,xp2,xa)| -parallel(xt,xq,xr,xcs)| -parallel(xt,xq,xp1,xp2)|T(c12112(xt,xq,xr,xcs,xp1,xp2,xa),b12112(xt,xq,xr,xcs,xp1,xp2,xa),xt).
269 [] xc2!=ext(xp1,xp2,xp1,xa)|opposite(xt,xr,xcs,xc2)|Col(xt,xq,xa)| -Col(xr,xcs,xa)| -Col(xp1,xp2,xa)| -parallel(xt,xq,xr,xcs)| -parallel(xt,xq,xp1,xp2)|Col(xp1,xp2,c12112(xt,xq,xr,xcs,xp1,xp2,xa)).
270 [] xc2!=ext(xp1,xp2,xp1,xa)|opposite(xt,xr,xcs,xc2)|Col(xt,xq,xa)| -Col(xr,xcs,xa)| -Col(xp1,xp2,xa)| -parallel(xt,xq,xr,xcs)| -parallel(xt,xq,xp1,xp2)|Col(xr,xcs,b12112(xt,xq,xr,xcs,xp1,xp2,xa)).
271 [] xc2!=ext(xp1,xp2,xp1,xa)|opposite(xt,xr,xcs,xc2)|Col(xt,xq,xa)| -Col(xr,xcs,xa)| -Col(xp1,xp2,xa)| -parallel(xt,xq,xr,xcs)| -parallel(xt,xq,xp1,xp2)|xa!=c12112(xt,xq,xr,xcs,xp1,xp2,xa).
359 [] s(xa,s(xa,xp))=xp.
360 [] -Col(t,q,a).
361 [] Col(r,cs,a).
362 [] Col(p1,p2,a).
363 [] parallel(t,q,r,cs).
364 [] parallel(t,q,p1,p2).
365 [] -T(xc,xb,t)| -Col(p1,p2,xc)| -Col(r,cs,xb)|a=xc.
366 [] c2=ext(p1,p2,p1,a).
370 [] ca1=c12111(t,q,r,cs,p1,p2,a).
371 [] cb1=b12111(t,q,r,cs,p1,p2,a).
372 [] ca2=c12112(t,q,r,cs,p1,p2,a).
375 [] ext(p1,p2,p1,a)=c2.
380 [] b12111(t,q,r,cs,p1,p2,a)=cb1.
381 [] c12112(t,q,r,cs,p1,p2,a)=ca2.
382 [] b12112(t,q,r,cs,p1,p2,a)=cb2.
493 [hyper,270,116,361,362,363,364,demod,375,359,382,unit_del,360] opposite(t,r,cs,c2)|Col(r,cs,cb2).
494 [hyper,269,116,361,362,363,364,demod,375,359,381,unit_del,360] opposite(t,r,cs,c2)|Col(p1,p2,ca2).
495 [hyper,268,116,361,362,363,364,demod,375,359,381,382,unit_del,360] opposite(t,r,cs,c2)|T(ca2,cb2,t).
511 [para_into,366.1.1,366.1.1,demod,375,375] c2=c2.
567 [para_from,370.1.2,267.8.2,demod,375,unit_del,360,361,362,363,364] x!=c2| -opposite(t,r,cs,x)|a!=ca1.
568 [para_from,370.1.2,265.8.3,demod,375,unit_del,360,361,362,363,364] x!=c2| -opposite(t,r,cs,x)|Col(p1,p2,ca1).
569 [para_from,370.1.2,264.8.1,demod,375,380,unit_del,360,361,362,363,364] x!=c2| -opposite(t,r,cs,x)|T(ca1,cb1,t).
580 [para_from,371.1.2,266.8.3,demod,375,unit_del,360,361,362,363,364] x!=c2| -opposite(t,r,cs,x)|Col(r,cs,cb1).
591 [para_from,372.1.2,271.8.2,demod,375,unit_del,360,361,362,363,364] x!=c2|opposite(t,r,cs,x)|a!=ca2.
611 [hyper,365,495,494,493,factor_simp,factor_simp] opposite(t,r,cs,c2)|a=ca2.
612 [binary,567.1,116.1,demod,359] -opposite(t,r,cs,c2)|a!=ca1.
658 [hyper,591,116,611,demod,359,factor_simp] opposite(t,r,cs,c2).
676 [para_into,612.1.4,366.1.1,demod,375,unit_del,658] a!=ca1.
677 [binary,658.1,580.2,unit_del,511] Col(r,cs,cb1).
678 [binary,658.1,569.2,unit_del,511] T(ca1,cb1,t).
679 [binary,658.1,568.2,unit_del,511] Col(p1,p2,ca1).
783 [binary,678.1,365.1,unit_del,679,677,676] $F.